hey just did a bunch of **** and i am confused as to which header to order....i have a b16a block, hi flow cat co, ITR b pipe...ik i am going to need something with a 2.5" collector. i want something that will bolt right up. HEEEEEEEEEELP

 

this buddy of mine was thinking ITR 98 spec header...would that work with his current set up

 

anyone know